Fuse construction



Feb. 11, 1941. w. o. sc HuLTz Fuss cons'rnuc'ron Filed Aug. 2e, 1939 3Shasta-Sheet 2 INVENToR. WML/,4M O. Sag/fz Feb. 11, 1941. w. o. scHuLrz'2,231,509

FUSE CONSTRUCTION Filed Aug.. 2 6, 1959 3 Shoots-Shout 'I5 Patented Feb.11,1941y PATENT OFFICE yassumo rusa CONSTRUCTION William 0. Schultz,South Milwaukee,

signor to Line Material wie., u"- Cominy. South Milwaukee, Wis., acorporation of Delaware Application August 26, 1939, Serial'No. 292,039

This invention relates to fuse constructions and is particularlydirected to a drop-out fuse.

Objects of this invention are to provide a housed type of drop-out fusein which the fuse slides downwardly after ruptured and projects from thehousing and givesa visual indication that the fuse has blown, and toprovide a construction in 'which a novel form`of fuse link extractingmeans is employed for quickly extracting any remaining portion of thefuse link before the fuse tube has moved away from a stationary contactto thereby prevent pitting of the contacts.

Further objects are to provide a drop-out fuse construction in which asliding type fuse tube is employed, in which a fuse link extractingmember is provided which first extracts any remaining portion of thefuse link and thereafter re'- leases such remaining portlonand alsodeta'ches` itself from a stationary live portion of vthe apparatus anddrops downwardly with the fuse tube itself, such fuse link extractingmember being carried by the fuse tube.

This invention, therefore, has for its further object to provide a fuselink extracting means carried by the fuse tube itself so that when thefuse tube slides downwardly after rupture of the fuse link, there are nolive projecting parts extending downwardly or outwardly from thehousing, but instead in which the fuselink extracting means at the lowerportion of the fuse tube is electrically dead, and in which there aren'o hanging fragments of fuse link.

Further objects 'are to provide a double lever construction for ,thefuse link extracting means so that the free end of the lever activelyengaging the fuse link executes a motion approximating va straight linedownwardly from adjacent the lower portion of the fuse tube, in whichsuch free end of the fuse link extracting means executes a very quickstroke and. ,moves a material distance prior to therelease of the fuselink and prior to any motion of the vfuse tube, the fuse tube remaininghas operated, and thereafter the fuse tube sliding downwardly away fromone ofthe stationary contacts and thus providing an additional point thefuse link has been in contact with a stationary cond, tact until afterthe fuse link extracting means 'nomma (cieco- 114)- gases and initiallyoccupies a position to the side of and protected by the fuser tubeitself and thereby not only being guarded against the action of theincandescent gases but also leaving the'bore of the fuse tube free andunobstructed. 5

Further objects are to provides. novel form of drop-out fuse in whichthe fuse link extracting means also automatically holds the fuse linkclamped in place without requiring the use of a thumb screw or othermember, in which refusing may be accomplished with the utmost ease, andin which the fuse link during refusing may be hooked over the fuse linkextracting means and thereafter the fuse link extracting means and thefuse tube may be slightly rotated to move or rock the fuse linkextracting means into fuse link clamping position.

Further objects are to provide a novel form of stationary contactincluding clamping means for the lead-in conductors so that the lead-incon- 20 ductors may be clamped in a very easy and simple manner.

An embodiment of the'invention is shown in the accompanying drawings,in'which:

Figure 1 is a vertical sectional view, with parts 25 broken away,showing the parts in their operative positions.

Figure 2 isa fragmentary view of the lower portion of Figure 1, suchview being partly" in section and partly broken away, showing the finalposition of the parts after the fuse link has been ruptured.-

Figure 3 is a view showing the mounting of the device at .an angieinstead of vertically as shown in Figures 1 and 2.

Figure 4 is a view from the bottom of the device.

Figure 5 is a sectional view on the line 5--5 of Figure 1.

Figure 6 is a view of the fuse tube and door 40 assembly removed fromthe housing, such view Y being a bottom view and showing the position ofthe parts during one stage in refusing. A

Referring to the drawings, it will be seen that the device comprises aporcelain or other housing i provided with a door 2 of insulatingmaterial, such as a phenolic condensation compound. The door is providedwith a handle or eyelet portion 3 for manual operation.

An upper and a lower contact indicated generally by the referencecharacters 4 and 5 are provided and may consist of approximatelyU-shaped metal members formed of strap material and indicated at t and 1respectively. These members, as may be seen from Figure 5, 55

have a relatively at transverse portion 3 to which the upper and lowercontact fingers are secured. For example, the upper contact may comprisea pair of laminated spring contact fingers 9 joined by a transverseportion IIJ secured to the fiat portion 8 of the member 6 by means ofscrews II.

The lower contact is providedwith U-shaped contact spring arms I2 whichare backed by an outer spring member I3, as may be seen most clearlyfrom Figure 4. Each of the upper and lower contacts is provided with aclamping/plate I4 which is adapted to, clamp an incoming conductor orlead-in wire when such plate is drawn forwardly by means of screws orbolts I5 which are threaded into the plates.

These screws or bolts are preferably provided with polygonal heads andmay have slots for the reception of a screw driver so that the linemancan use either a socket wrench or a screw driver to draw the plates I4forwardly to clamp the incoming leads. Preferably the members 6 and 1are notched out as indicated at I6 and I1 to facilitate the insertionof' the leads between the plates I4 and the portions 8.

The members 5 and 1 have rearwardly extending legs which are cemented,leaded or otherwise secured to the housing I. Preferably the housing isprovided with the usual intermediate barrier I8.

A pair of supporting hook like members I9 are provided for the receptionof the trunnions hereinafter described and are provided with side walls2D and a transverse wall or member 2|. The members 20 and 2i, as shownin Figure 1, are cemented, leaded or otherwise secured to the housing I.

The housing I is adapted to be carried by any suitable support and maybe mounted vertically as shown in Figures 1 and 2 or may be 'mounted ina slanting position as shown in Figure 3.

'Ihe door carries a guide or sleeve 22 which ls permanently securedthereto and which slidabiy receives the fuse tube 23. The sleeve 22 isprovided with shouldered portions or projections 24 which have abruptfront faces 25 and slanting rear cam like faces 25.

The door and fuse tube assembly is normally held closed as theprojections 24 are received behind the inwardly curved or bent portions21 of the contact ngers I2, see Figure 4, and thus the door and fusetube assembly is yieldingly held closed. Further, when the fuse tube isin its operative position as shown in Figure 1, the upper contactfingers 9 also assist in holding the fuse tube and door assembly inclosed position as such iingers are upwardly arched and t over theprojections 28 formed on the upper contact 29 of the fuse tube, thoughthese lingers are not relied upon to hold the door closed when the fusetube drops downwardly as shown in Figure 2, as the engagementoi.'the-inward projections 21 of the contact fingers I2 with the portions 24of the sleeve holds the door closed.

The door is provided with a rearwardly projecting upper portion 30 whichreceives a pin 3I 'I integral with the screw cap 32 of the fuse tube.

. The door may also be provided with a bracing web 33 which joins theprojecting portion or apertured tongue 33 and also forms a stop againstwhich the cap 32 'of the i'use tube bears.

A fuse link is positioned within the fuse tube and is provided with afusible portion 34 and 'a flexible leader 35 which latter projects outof the open bottom end oi' the fuse tube and lspreferably guided througha notch 35 formed in the bottom edge. of the fuse tube, as shown inFigure 1. The fuse link has an upper button-head which is clamped inplace by the screw cap 32.

. The sleeve 22 is provided with a rearwardly projecting arm 31 which isequipped with a transversely extending cylindrical portion 38terminating in trunnions 39. 'I'he trunnions 39 are adapted to beremovably received within the hook supports I9, as shown in Figures 1and 2. It is to be noted particularly from Figure 6, that the arm 31 isoiIset and that the cylindrical portion 33 projects laterally from thearm. This cylindrical portion is cut away to provide a flat face 43, asshown in Figures 1, 2 and 6.

The arm 31 is provided with a rounded portion 4I which normally ispositioned below the overhangihg transverse portion 2I of the hooksupports I9. The purpose of this construction is to guard againstinadvertent detachment of the fuse tube and door assembly from the hooksupports I9 as it is apparent that the assembly cannot be detached fromthe hook supports I9 until the assembly is rocked downwardly to positionthe flat portion 43 so as to allow it to clear the overhanging portion2|, as will be apparent from an examination of Figures 1 and 2. Underthese conditionsfthe assembly may be unhooked from the hook portions I9and may be readily removed Irom the housing for refusing.

I'he lower portion of the fuse tube is provided with a collar 42 rigidlysecuredthereto and provided with a pair of rearwardly projecting ears 43which carry the plntle pin 44, see Figure 2.

A link member 45 formed of two spaced plates and joined by a transverseportion 46 is pivotally carried by the plntle pin. A spring 41 isloosely coiled about the pin and urges the link 45 in a counterclockwisedirection from the position shown in Figure 1 towards the position shownin Figure 2.

A lever 43 is pivoted between the arms of the link 45 by means of theplntle pin 49, see Figures 1 and 2, and is provided with a free forwardend 50 which is slightly cut out to conform approximately to the contourof the fuse tube, as shown in Figures 4 and 6. The lever'43 extendsrearwardly and is provided with a fuse link clamping tongue 5I.

The link 45 and the lever 48 normally occupy the position shown inFigure 1 and the leader 35 of the fuse link is positioned beneath thelever 48 and is clamped between the clamping tongue or portion 5I of thelever and the cylindrical member 38 of the arm 31, and thus the use o! athumb nut is avoided.

It is preferable to form the portion 5I of the lever 43 with aprojecting tongue 52 toy facilitate refusing, as will hereinafterappear. The assembly of the link 45 and the lever 43 constitutesrestraining means for restraining the fuse tube and also constitutesfuse link extracting means and thus forms a combined fuse linkextracting means and restraining means.

The operation of the apparatus is as follows:

Assuming the parts are in the position shown in Figure 1 and an overloadoccurs. The i'use link is ruptured and me lever 48 is released. 'Thespring 41 rocks the link 45 in a counterciockwise direction carryin theplntle pin 49 of the lever 43 downwardly. n view of the fact that theportion 5I of the lever 48 bears against the fuse link, which linkinturn bears against the cylindricalportion 33, it is apparent that thefree a very rapid manner, multiplying the rocking motion of the link andquickly withdrawing any remaining portion of the fuse link. Finally theportion 5i of the lever 4i!k will clear the cylindrical portion 38 andwill thus release any remaining portion of the fuse link, which latterwill fall or be thrown from the device.

It is to be noted that due to the rocking motion of the link 45, thatthe pintle pin 49 will rock downwardly towards the open end of the fusetube and that the free end of the lever i8 will tend to the pintle pintd. The result of these two motions is that the free end 50 oi the lever4E will move approximately directly downwardly and will thus withdrawany remaining portion oi' the fuse link by a pull exerted substantiallydirectiy4 downwardly, thus minimizing friction and per mitting the use arelatively stiffer leader.

ln view of 'the iact that due to the action. of the spring di theportion 50 of the iever ii presses downv ily against any remaining tionoi the fuse and `thereby accelerates such portion of use link, it isapparent that is a reactive upward thrust exerted on the fuse tube whichholds the fuse tube with its upper contact in engagement with thestationary upper contact of the housing until after the fuse linkextracting action has taken place, and consom quently until after thecircuit has been interrupted within the fuse tube, thus avoiding pittingof the upper contacts. Additionally, the reactive forces4 of the gasesbeingdischarged from. the lower end of the fuse tube tend to hold thefuse tube in its uppermost position until this blast of gases hasceased. -The upward reaction is resisted lay-engagement of the collar 42with the lower' portion of the sleeve 2 2.

The fuse tube thereafter drops downwardly to the position shown inFigure 2 and it is to be particularly noted that the fuse `linkextracting means moves away from the live portion of the apparatus andconsequently is electrically dead.

If desired, the arm 31, see 'Figures l and 2, may have a nat portionpositioned below the lower contact i to thus prevent the upper edge ofthe door upon recoil from striking the adjacent portion of the housing.a

In refusing the device, the lineman rocks the fuse link extracting meansinto the position shown in Figure 6 clear of the cylindrical portion 38and moves the fuse link extracting means backY into its initialposition, pulling the leader of the fuse link into the position shown inFigure 6. Thereafter he rocksY the fuse tube assembly so as to positionthe fuse link extracting lever above the cylindrical' portion 38, thelug 52 ofthe portion' 5| of such lever assisting in holding the fuselink against lateral shifting. Thereafter the portion 5| clamps theleader 35 of the, fuse link against the cylindrical portion 3B. Thelinemanl thenv hooks the trunnions 39 into the hook sup-portal! androcks the door to closed position.

It will be seen that a drop-out fuse device has been provided in whichthe fuse tube slides downwardly after the fuse link has been rupturedand that the fuse link is discharged from the device.

It will be also seen that the lower end of the fuse tube assembly isdead when it projects downwardly from the housing as the fuse linkextracting means has detached itself from engagement with any liveportion of the apparatus.

usb it is apparent-that the :use nnk wm be readily and quickly withdrawnfrom the fuse tube rock downwardly and to the left of ing said fuse tubeand at the same timeV with a minimum of friction due to the fact thatthe free end of the fuse link extracting lever exerts a pullsubstantially directly downwardly upon the fuse link.

. The device may be easily refused when the door and fuse tube assemblyare detached from the casing and this assemblyY may be readilyrepositioned after refusing by merely hooking the trunnions back intothe hook supports and rocking the door to closed position.

Although this invention has been described in considerable` detail, itis to be understood vthat such description is intended as illustrativerather than limiting, as the invention may be variously v embodied andis to be interpreted asclairned.

I claim:

l. A housed type of drop-out fuse comprising a housing, a fuse tube anddoor assembly, supporting means including pivot means for supportdoorassembly from said housing, said fuse tube being mounted to dropoutwardly from operative to inoperative position, restraining means'carried by said fuse tube and. movable therewith for normallyrestraining said 'fuse tube from motion from operative to inoperativeposition, said restraining means cooperating with said supporting meansadjacent said pivot means and moving away from said supporting meanswhen said fuse tube moves to inoperative position, and a iuse linkwithin said fuse tube controlling said restraining means.

2. A housed type of drop-out fuse comprising a housing, a fuse tube anddoor assembly, supporting means including pivot means for supportingsaid fuse tube and door assembly from said housing, said fuse tube beingmounted to drop outwardly from operative to inoperative position,restraining means carried by said fuse tube and movable therewith fornormally restraining said fuse tube from motion from operative tonoperative position, saidrestraining means cooperating with saidsupporting means adjacent said pivot meansY and moving away from saidsupporting means when said fuse tube moves to inoperative position, anda ruse link within said fuse tube controlling said restraining means,said restraining means being electrically vdead when said fuse tube hasmoved to inoperative position.

3. A housed type of drop-'out Iuse comprising a housing, a fuse tube anddoor assembly, supporting meansincluding pivot means for supporting saidfuse tube and door assembly from said housing, said fuse tube beingmounted to drop outwardly from operative to inoperative position,restraining means carried by said fuse tube and movable therewith fornormally restraining, said fuse tube from motion Irom'operative toinoperative position, said restraining means cooperating with saidsupporting means yadjacent said pivot means and moving away from'saidsupporting means when said fuse tube moves to inoperative position, anda fuse link within said fuse tube controlling said restraining means,said restraining means withdrawing any remaining portion of said fuselink upon rupture of said fuse link.

4. A housed vtype of drop-out fuse comprising a housing, a fuse tube anddoor assembly,support ing means including pivot means for supportingsaid fuse tube and door assembly from said housing, said fuse tube beingmounted to drop outwardly Iromoperative to inoperative position,restraining means carried by said fuse tube and movabley therewith fornormally restraining said fuse tube from motion from operative toinoperative position, said restraining means cooperating iii Sii

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with said supporting means adjacent said pivot means and moving awayfrom said supporting means when said fuse tube moves to inoperativeposition, and a fuse link within said fuse tube controlling saidrestraining means, said restraining means withdrawing and dischargingany remaining portion of said fuse link upon rupture of said fuse link.4

5. vA drop-out type of fuse assembly comprising a' stationary portion, adrop-out fuse tube having an open lower end, supporting means forsupporting said fuse tube from said stationary portion, said fuse tubehaving movement with reference to said supporting means and movable fromoperative to inoperative position, a fuse link within said fuse tube,and combined fuse link extracting and Afuse tube restraining meanscarried by said fuse tube and having a portion movable downwardly fromthe open lower end of said fuse tube to extract any remaining portion ofthe fuse link by a p ull substantially in line with said fuse tube andto release the fuse tube upon rupture of said fuse link.

6. A drop-out type of fuse assembly comprising a stationaryportion, adrop-out fuse tube having an open lower end, supporting means forsupporting said fuse tube from said stationary portion, said fuse tubehaving movement with reference to said supporting means and movable fromoperative to inoperative position, a fuse link withf in said fuse tube,and combined fuse link extracting and fuse tube restraining meanscarried by said fuse tube and having a portion movable downwardly fromtheopen lower end of said fuse tube to extract any remaining portion oi'the fuse link by a pull substantially in` line with said fuse tube andto release the fuse tube upon rupture of said fuse link, said portionbeing located to the side of said fuse tube and adjacent the open lowerend thereof, whereby said portion is protected from the blast of gasesfrom said fuse tube and leaves the bore of said fuse tube unobstructed.

7. .A drop-out, type of fuse assembly comprising a stationary portion,adrop-out fuse tube having an open lower end, supporting means forsupporting said fuse tube from said stationary portion, said fuse tubehaving movement with reference to said supporting means and movable fromoperative to inoperative position, a' fuse link within said fuse tube, alink pivoted to said fuse tube adjacent the open lower end and having anouter end movable downwardly', a lever pivoted to the outer end of saidlink and having a free end located adjacent the open lower end of saidfuse tube and movable downwardly with reference to said fuse tube, saidfuse link normally restraining said lever, and means supported by saidstationary portion and cooperating withsaid lever to hold said fuse tubein operative position.

8. A drop-out type-of fuse assembly comprising a stationary portion, afuse tube having an open lwer en'd, means supported from said stationaryportion for slidably guiding said fuse tube, a link pivoted to said fusetube adjacent the open lower end and having a. free end projecting fromsaid fuse tube, a lever pivoted to the free end of said link and havinga rst end adjacent the open lower end ofl said fuse tube and having vasecond end projecting laterally therefrom, a fuse link located withinsaid fuse tube and passing beneath said first end of said lever, and arelatively stationary member cooperating with said second end of saidlever, whereby said fuse` tubel is normally restrained against sliding,said fuse link upon rupture releasing said rst end of said lever.

9. A drop-out type of fuse assembly comprising a stationary portion, afuse tube having an open lower end, means supported from said stationaryportion for slidably guiding said fuse tube, a link pivoted to said fusetube adjacent the open lower end and having a free end projecting fromsaid fuse tube, spring means urging the free end of said linkdownwardly, a lever pivoted to the free end of said link and having aiirst end adjacent the open lower end of said fuse tube and having asecond end projecting laterally therefrom, a fuse link located withinsaid fuse tube and passing beneath said first end of said lever, and arelatively stationary member cooperating with said second end of saidlever, whereby said fuse tube is normally restrained against sliding,said link-upon rupture releasing said rst end of said lever.

10. A housed type of drop-Out fuse comprising a casing, a door, a fusetube slidably carried by .said door, supporting means pivotallysupporting said door from said housing, a link pivotally mounted on saidfuse tube adjacent one end of said fuse tube and having a free end, alever pivoted intermediate its ends to the free end of said linkandhaving a first end located adjacent said fuse tube and having asecond end cooperating with said supporting means to restrain said fusetube against motion, and a fuse link within said fuse tube releasablyholding said lever against motion,

1l. A housed type of drop-out fuse comprising a housing, a fuse tube anddoor assembly,

supporting means including pivot means for pivotally supporting saidassembly from said housing, said fuse tube being slidably carried bysaid door, restraining means carried by said fuse tube and cooperatingwith said supporting means adjacent said pivot means to restrain saidfuse tube against sliding, and a fuse link within said fuse tubecontrolling said restraining means.

12. A-housed type of drop-out fuse comprising a housing, a fuse tube anddoor assembly, supporting means including pivot means for pivvotallysupporting said assembly from said housing, said fuse tube beingslidably carried by said door, restraining means carried by said fusetube and cooperating with said supporting means adjacent said pivotmeans to restrain said fuse tube against sliding, and a fuse link withinsaid fuse tube controlling said restraining means, said restrainingmeans moving completely away from said pivot means upon rupture of saidfuse link.

13.'A housed type of drop-out fuse comprising a housing, a fuse tube anddoor assembly, supporting means including pivot means for pivotallysupporting said assembly from said housing, said fuse tube beingslidably carried by said door, restraining means carried by said fusetube and cooperating with said supporting means adjacent said pivotmeans to restrain said fuse tube against sliding, and a fuse link withinsaid fuse tube controlling said restraining means, said restrainingmeans moving completely away from said pivot means and discharging anyremaining said fuse tubeno reference to said supporting means andmovable from operative to inoperative *position, a fuse link within saidfuse tube, and a double jointed mechanismk constituting combined fuselink ex lhaving an open lower end., supporting means for supporting saidfuse tube from, said stationary portion, said fuse tube having movementwith reference to said supporting means and movable from operative toinoperative position, a fuse link within said fuse tube, and a doublejointed mechanism constituting combined fuse link extracting and fusetube restraining means includ--l ing a lever having a movable pivotpoint intermediate the ends of said lever' and said lever having aforward end adjacent the lower open end of said fuse tube and having arear end cooperating with said supporting means to restrain said fusetube, said fuse link passing out of the lower open-end of said fuse tubeand over the forward end of said lever, said combined fuse linkextracting and fuse tube restraining means being carried by saidfusevtube and movable therewith and being eieetricuy dead after saidfuse tube has movedl to inoperative position.

16. Al drop-out type of fuse assembly compristi a rtion, a slidablmounted l m s' sta on ry po y electrical device comprising a U-shapedsupport.

drop-out fuse4 tubehaving an open lower end, supportingl means supportedfrom said stationary portion and slidably holding said fuse tube, adouble jointed mechanism constituting a `combined fuse link extractingand fuse tube restraining means including a lever carried by the fusetube and releasably restraining said fuse tube from motion and having afree end movable in a direction substantially downwardly from the`lowerendofthefuset be,andafuselinkwithin y restraining said lever frommotion.

,17. A drop-out fuse assembly comprising a stationary portion, a fusetube having an open lower end. supporting means supported from saidstationary portion forslidably guiding said fuse tube, a link pivoted onsaid fuse tube ad- Jscen-t the lower end and having a free `end pmursinsthe,

jecting from said fuse tube, a sping free end of said, link downwardly,a lever pivoted intermediate its-ends` to the end of said link andhaving a forward end adjacent the open lower end of said fuse tube andhaving a.l rear end adjacent said supporting means, and s fuse linklocated within said fuse tube and extending outwardly `through the openlower end thereof and passing beneath said forward end ofysaid lever andclamped between the rear end of said lever and said supporting means,whereby said fuse tube is normally restrained against sliding andwhereby upon rupture of said fuse link the forward end of said leverwill extract any remaining portion of said fuse link, said fuse linkbeing subsequently discharged from said 'assembly. l

18. A housed type of drop-out fuse comprising a casing, a door. supportmeans pivotally sup'- porting said door from said casing and having atransversely extending portion adjacent the pivot point, a fusertubeslidably carried by said door and having an open lower end, a fuse linkwithin said fus@ tube projecting outwardly of said open lower end, acombined fuse link clamping and fuse tube restraining means carried bysaid fuse tube and movable bodily with said fuse tube when said fusetube slides with reference to said door, said lever having a forwardend.

over which said fuse link is looped and having a rear end releasablyclamping said fuse link between itself and the transversely extendingportion of said support means.

19. A stationary contact construction for an electrical devicecomprising a U-shaped supporting member having the legs thereof adaptedfor attachment to a suitable support and having a relatively ilattransverse portion, yielding contact means secured to said relativelyhat transverse portion.' a conductor clamping plate positioned adjacentsaid relatively flat transverse portion, and attaching means accessiblefrom the front for drawing said plate towards iid relatively ilatportion to clamp a conduc- 205A stationary contact construction for aning member having the legs thereof adapted for attachment to a suitablesupport-and having a relatively flat transverse portion, yieldingcontact meansv secured to said relatively nat transversejportion, aconductor clamping plate positioned rearwardly oi' said relatively fiattransverse portion, and attaching means accessiblej from the frontextending through said relatively nat transverse portion and threadedinto said clamping plate, whereby a conductor may be clamped betweensaid plate and the rear face of said relatively nat transverse portion.

'21'. In a yhoused drop-out fuse construction. a housing. a door forrsaid housing. supporting means supported from said housing and carryingsaid doorl and including a sleeve. said hous- `ing havingv stationarycontacts, a fuse tube slidablycarried by said sleeve, a fuse link withinsaid fuse tube normally electrically connecting ssidstationarycontacts,l sn abutment carried by said supporting mns and spaced fromsaid sleeve, and a fuse link extracting member car'- ried by said fusetube and detachably inter- WILLIAM 0.*BCHUL1Z.

' lochng with said abutment and controlled by said fuse link.

